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Q: A: ### Quick Answer

Horizontal lines are parallel to the horizon or parallel to level ground. They have a slope of zero and are parallel to the x-axis on a graph. Vertical lines are perpendicular to the horizon, parallel to the y-axis on a graph and have undefined slope.

Know MoreThe term "horizontal" derives from the Latin "horizontem" which means "flat." The term "vertical" derives from the Latin "vertex," which means "highest point."

The slope of a line refers to the change in the rise, or y-value, divided by the run, or the change in x-value. Because a horizontal line does not change in y-value with changes in x-value, its slope may be calculated as zero divided by any number. This results in a slope of zero. For vertical lines, the slope equation leads to a division by zero, which is undefined.

Learn more about Shapes- Q:
## How many lines of symmetry does a hexagon have?

A:

Full Answer >**A regular hexagon with six equal sides has six lines of symmetry.**For all regular polygons, the number of lines of symmetry is equal to the number of sides.Filed Under: - Q:
## How many lines of symmetry does a triangle have?

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Full Answer >**The number of lines of symmetry a triangle has depends on the type of triangle.**An equilateral triangle has three lines of symmetry, while an isosceles has one line of symmetry, and a scalene triangle has none.Filed Under: - Q:
## How many lines of symmetry does a decagon have?

A:A regular decagon has 10 lines of symmetry, one line drawn through each vertex and one line drawn through the midpoint of each edge. A line of symmetry indicates where a polygon can be folded in half to form two equal shapes.

Full Answer >Filed Under: - Q:
## How many lines of symmetry does a pentagon have?

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Full Answer >**A regular pentagon has five lines of symmetry.**An irregular pentagon, with non-equal side lengths and internal angles, may or may not have any lines of symmetry.Filed Under: